Voltage-controlling device for dynamos



Patented Apr. 24, 1923.

PATENT OFFICE.

GROVER C. HUBBLE, OF BONNEBS FERRY, IDAHO.

VOLTAGE-CONTROLLING DEVICE FOR DYNAMOS.

Application filed December 2, 1921. Serial No. 519,493.

ToaZZ whom it may concern:

Be it known that I, Gnovnn C. HUBBLE, a citizen of the United States, and a resident ofBonners Ferry, in the county of Boundary and State of Idaho, have invented a new and Improved Voltage-Controlling Device for 'Dynamos, of which the following is a full,

clear, and exact description.

This invention relates to a device for controlling the field windings of dynamos. An object of the invention resides in the provision of means wherebythe excitation of dynamos may be very sensitively controlled, either by hand or by automatic means.

Another object resides in the provision of means whereby the field excitation of dynamos can be sensitively'controlled by automatic means which is actuated in accordance with load variations of the dynamo.

A further object resides in the provision "of means whereby the regulating device can be very accurately and substantially adjusted to vary the resistance thereof to give variations in load.

A still further object resides in the provision of simple, easily operable and readily applicable means for application to dynamos of well established construction with a minimum necessity for materially altering their construction to install the excitation re ulator.

Another object resides in the particular construction and arrangements of parts which are hereinafter described and claimed and shown in the accompanying drawings.

The invention is illustrated in the drawin s, of whichigure 1 is a side elevation of the dynamo with the regulating means shown attached.

Fig. 2 is a vertical transverse section take on the line 2-2 of Fig. 1.

Fig. 3 is a verticalsection taken on the line 3-3 of Fig. 1.

Fig. 4 is a partial end elevation of a modified form of regulating device.

Fig. 5 is a partial plan view thereof.

Fig. 6 is a circuit. diagram of the dynamo.

The form of the invention shown in the drawings is a preferred form, although it is to be understood that various other forms and modifications of the construction and arran 'ement of parts and the character of materialsused can be adopted without departing from the spirit of the invention.

The invention as shown is concerned with a dynamo having a base or bed 1 and a ring magnet 39 casting 2 supporting suitable field windings. A pedestal 3is mounted on the base 1 to support journal bearings 4 for the end of the 9, 10 and 11 are disposed. The commutator is provided with a plurality of brushes 12, 13, 14 and 15 of any well-known type and mounted in relation to the commutator 6 in any desired and suitable manner.

Disposed in relation to the commutator 6 are a pair of auxiliary brushes 16 and 17. The brush 16 is mounted between insulating plates 18 and 19 which are supported from a ring 20. This ring is disposed around the commutator 6 and rotates on ball bearings 21 which are disposed between it and a second ring 22. Similarly, the brush 17 is disposed between insulating plates 23 and 2 1 connected to a ring 25 which rotates on ball bearings 26 disposed between it and a ring 27. The rings 22 and 27 are supported on a T pedestal 28 mounted on the base 1.

The rotatable ring 20 supporting the brush 16 is operated by connections thereto of a bar 29 pivoted at one end to a rod 30 having an outer threaded end 31 passing through a bracket 32 connected to the ring 2 of the dynamo. A. hand wheel 33 is adapted in the well-known manner to move the rod 30 backward and forward so that the position of the ring 20 and, consequently, the brush 16 with respect to the commutator can be very nicely and accurately adjusted.

Similarly, the ring 25 is operated by a bar 34: to which is connected a pivot link 35, the other end of which is pivotally connected to a rocking lever 36. The other end of the rocking lever is pivotally connected to a rod 3? on the lower end of which a core 38 actuated by a magnet 89 is disposed. This is mounted on any suitable support such as 410 connected to the base 1. Therefore the operation of the core 38 results in the movement of the ring 25 to which the brush 17 is connected. This magnet may be energized by current having a relation directly proportional to the current produced by or applied to the dynamo. The rocking lever 36 issupplied with an angle bracket 41 to which is threaded an adjustable link 12 actuated by a winged nut 43. This link 12 is also connected to a yoke bar 44 having a downwardly projecting por means of adjusting screws 51 and 52 of any and in the operation of this magnet 39 the regulation is automatic and to a post 64 mounted on the base 1. spring tends to keep the ring 25 in a normal position when it 18 not belng moved by the suitable design, preferably operated by winged nuts such as 53. The fact thatthe pedestal can be moved through a certain distance and that the yoke bar can also be adjusted to vary the fulcrum point of the rocking lever 86, permits of a wide ad ust ment for the amount of movement given the right-hand end of the lever 36 for a given actuation of the core 38, and vice versa.

In Fig. 6 the windings 54 of the magnet 39 are shown in series with the series winding 55 of the machine. These series windings are connected to the ordinary brushes 12 to 15, inclusive, and the shunt field windings 56 are at one end connected to the usual brushesand at the other end are connected to either of the brushes '16 and 17. Therefore, by moving either the brush 16 or the brush 17 around a commutator, the voltage applied to the shunt winding canbe varied to determine the excitation caused by this winding. Consequently, the effect of this variation on the machine can be regulated, regulator by the maybe adjusted to be proportional to any desired characteristic of the machine, such as variation in the loads. On the other hand, if the brush 17 is actuated, the adjustment is effected by the manual operation of the hand wheel 33 to produce degree of eXcitation. The ring 25 has connected thereto a pin 62 to which a spring 63 is connected, the other end of-the spring being connected This magnetic means above mentioned.

InFigs. 4 and 5 a similar construction 1s shown in which the auxiliary brush is actuated through a supporting ring, such as 57.. and through linkages 58, 59 and 60, by means of a centrifugal governor 61 of any well known or suitable construction and connected to the shaft 5 of'the dynamo. In this case, therefore, the speed of the armature determines the variation in the excitation in the windings, whether they be shunt iieid windings or any other windings the excitation in which it is desired to control.

By means of these applications of the invention, I, therefore, have provided a simple,

can be raised from the commutator as shown in Fig. 2 so that only one, if desired, may be left in contact therewith at a time.

l Vhat I claim is: l. A regulator for dynamos having a coin mutator and a winding, which comprises a substantially stationary brush andv a movable brush associated with the commutator, said winding being connectedbetween said brushes, a stationary ring surrounding the commutator but spaced therefrom, a movable ring rotatablysupported from the sta-' tionary ring and carrying. the movable brush, a magnet, a core for said magnet, and linkage between the core and the movable ring whereby variations in the current flowing through the magnet winding will move the ring to vary the voltage applied to the winding as result of the movement of the movable brush. H a i 2. An adjusting means for regulators of dynamos, which comprises a brush, abrush support, rocking lever associated with said support to move the same means for rocking the lever, an adjustable fulcrum connected to said lever, and a pedestalhaving an elongated slot in its upper end to receive the adjustable fulcrum. V

3. An adjusting means for regulators pf dynamos, which comprises a brush,a brush support, a rocking lever associated with said support to move the same, means for rocking the lever, an adjustable fulcrumconnected to said lever, a pedestal having an elongated slot in its upper end tov receive the adjustable fulcrum, and means for adjusting the position of the pedestal.

4. An ad usting device which comprises a rocking lever, a fulcrum bar adjustably mounted thereon, a pin on said bar, and a pedestal associated with said lever having an elongated slot in its u'pperend through which said pin is adapted to pass, the adjustment of the fulcrum bar on the lever determining the position of the fulcrum point of the lever. with respect to the pedestal.

5. An adjusting devicewhich comprises rocking lever, a. fulcrum bar adjustably, mounted thereon, a .pin on said bar, a pedestalassociated with said lever having an elongated slot in its upper end'through which said pin is adapted to pass, the adjust.- ment of the fulcrum bar on the lever'deterthe lever With respect to the pedestal, and. means for adjusting the position of the pedestal with respect to the lever.

6. A regulator for dynamos having a com- 5 Inutator and a winding, which comprises a l the rotation of the outer ring on the inner ring, a rigid support for the stationary ring, a brush carried by the rotatable ring, a substantially stationary brush associated with the commutator, a field winding connected between said brushes, and means actuated by power variations in the dynamo to move the rotatable ring and vary the distance between the brushes along the commutator whereby the excitation of the windings is varied.

GROVER C. HUBBLE. 

